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| Researchonthe Damping Performance of the Long - spanDeckType Steel Truss Railway Arch Bridge |
| ZHANG Yong - Using1，DONG Yang1，ZHU Shang - qing2，CHEN Xing - chong1，DING Ming - bo1 |
| (1.Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China;2. Beijing Municipal Bridge Maintenance Management Group Co. Ltd，Beijing 100097，China) |
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Abstract Res earch purposes ： Taking a long - span steel truss railway arch bridge as the engineering background， damping performance of the steel truss arch bridge with thrust in the longitudinal， transverse direction based on the speed locking device， viscous fluid damper and BRB( buckling - restrained brace) is analyzed by adopting nonlinear time history analysis method according to structural characteristic of the steel truss arch bridge with thrust. Research conclusions :( 1) When main bridge and approach bridge are connected into a whole unit using speed locking device，damping effect for internal force of the members in arch foot section is obvious， such as damping ratio of the moment is about 20% . But damping ratio of internal force for the members in L/4 arch， crown section and column bottom section is poor，even internal force of the most of them have a greater range of increase than no damping. (2) When viscous fluid dampers are set in junction piers of main bridge，damping effect for internal force of the members in arch foot section and column bottom section is obvious，such as damping ratio of the moment is about 10%. Although damping effect of the scheme in arch foot section is less than that of the speed locking device scheme，seismic response of the members in arch ring and the column decreases to different degrees，and the phenomenon that seismic response of individual members significantly increases doesn’t appear. (3) When BRB of the K bracing are set in the Bottom and top of chord plane in main arch ring，damping effect for internal force of the members in arch foot section and column bottom section is obvious，such as damping ratio of the moment and the shear is about 10% ?20℃. But damping ratio of internal force for the members in 1/4 arch,crown section is different. Damping effect of some members is obvious,but seismic response of some members obviously increases. (4) The research results may provide references for damping design of the steel truss railway arch bridges with thrust in the high intensity earthquake zone.
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Received: 07 September 2015
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2016, Vol. 33 
